json_example is an example extension that provides everything to use the JSON view shipped with the TYPO3 core.
The extension requires TYPO3 10LTS (For lower TYPO3 versions check out previous releases).
Install the extension and include the static TypoScript. You may want to add some records of type tag and post in the backend to provide actual output.
For detailed information regarding this extension please visit https://usetypo3.com/json-view.html